Jika sin A= 3/5 maka cosinus (180+A)=

Sin A = 3/5 = depan / miring
Samping = akar 5^2 -3 ^2 = akar 16= 4
cos A = samping / miring = 4/5
cos (180+A)=cos 180.cos A - sin 180.sin A
= -1. 4/5 - 0. 3/5
= -4/5
Jadiin jawaban terbaik ya